CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED BALANCE SHEETS
Accounts receivable, accumulated provision for doubtful accounts (in dollars)	$ 5,171	$ 5,883
Common stock, par value (in dollars per share)
Common stock, authorized shares	320,000,000	320,000,000
Common stock, shares issued	175,684,000	175,684,000
Treasury stock, shares	24,800,000	25,575,000